After configuring a Cisco CallManager Express with Cisco Unity Express, inbound calls from the PSTN SIP trunk receive a ring tone for 20 seconds and then a busy signal instead of voicemail. Which conf

Question

Exhibit

Options

• ARouter(config)# voice service voip, Router(conf-voi-serv)#allow-connections h323 to h323
• BRouter(config)#dial-peer voice<0> voip, Router(config-dial-peer)#no vad
• CRouter(config)# voice service voip, Router(conf-voi-serv)#allow-connections voice-mail mod
• DRouter(config)# voice service voip, Router(conf-voi-serv)#no supplementary-service sip moved-temporarily

• A
  5% (3)
• B
  11% (7)
• C
  3% (2)
• D
  81% (50)

Explanation

When a call goes unanswered, CME triggers call-forward-to-voicemail by sending a SIP 302 Moved Temporarily redirect to the PSTN SIP provider. Many SIP providers do not support 302 redirect and respond with a busy signal instead of re-routing the call to voicemail. The command 'no supplementary-service sip moved-temporarily' disables the 302 redirect mechanism, causing CME to instead hairpin the call internally to Unity Express voicemail. Option A is irrelevant (H.323-to-H.323 connections). Option B disables VAD/silence suppression, which does not affect call forwarding behavior. Option C is not a valid IOS command.

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